Nope, The '76-77 up are essentially identical to 302 heads except for the headbolt size, but prior to that, they had slightly larger valves than the 5.0. I'm have '75 castings on my Comet and the stock valves were larger than my 289's. I used 351's because it was easier to put the 1.94/1.60's in 'em (less machining). I reserve the right to be wrong on the years on these but I'm pretty sure the change occured '76-77.On 2002-01-15 19:08, 331NosMustang wrote:
fxcomet,I THINK,all 351W's had the SAME valves even to this day!!PLEASE let me know something I don't!!Maybe a CLEVELAND 351 had different valves!!!!